We've dealt with many cases of such tendency.
This normally happens in mehran, alto, cultus
Even cross member kay upar, there are joints, which are called mukkian they get apart...
It's not a tig or mig job...
It's a denters job, denter seals the joints... And after that iske upar seal lagi hoti hai which is also easily available... Wo seal laga kar same shade ka paint hoga and no one will be able to judge about this... And nothing to worry it's really common in Suzuki mehran, alto, cultus or mostly hatch cars of low standard.